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Today's Topics:
1. Re: Date Time in Haskell (Dananji Liyanage)
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Message: 1
Date: Thu, 14 May 2015 17:24:26 +0530
From: Dananji Liyanage <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] Date Time in Haskell
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<caapsy8yqz5vhbpevgokmwfioaorhc5k7wnp7y-cnreqjy-t...@mail.gmail.com>
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Thanks Max!!
On Thu, May 14, 2015 at 4:57 PM, Max Voit <[email protected]>
wrote:
> On Thu, 14 May 2015 16:27:46 +0530
> Dananji Liyanage <[email protected]> wrote:
>
> > Correct me if I'm doing something wrong here. Here's my code:
> >
> > main = do
> > now <- getCurrentTime
> > diffUTCTime now bree
> > bree = readMay "1981-06-16 04:35:25" :: UTCTime
>
> There are several problems with that code. First what the compiler is
> complaining about: Last statement in a do-block must have type of the
> block, in this case IO () - so print it or return ()
>
> For the readMay - this is expected to return Maybe UTCTime. To stuff
> this into diffUTCTime you need to get it out of the Maybe.
>
> For my formulation "is expected to" - it won't, as UTCTime has no Read
> instance (so you can't call read on it). Take a look at ParseTime and
> its buildTime method.
>
> cheers, max
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--
Regards,
Dananji Liyanage
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